刘希琴
Associate Professor
Education Level:上海医科大学
Degree:Master's Degree in Medicine
School/Department:College of Material Science and Technology
Discipline:Nuclear Technology and Applications. Material Science
E-Mail:
Hits:
Affiliation of Author(s):材料科学与技术学院
Journal:HIGH TEMPERATURE MATERIALS AND PROCESSES
Key Words:dynamic recrystallization behavior vanadium microalloyed cryogenic fine grain structural steel pipe high strain rate
Abstract:Dynamic recrystallization (DRX) behavior of a vanadium microalloyed steel pipe was systematically investigated at temperatures range of 850-1,200 degrees C and a strain rate of 5 s(-1) on a Gleeble-3800 thermo-simulation machine. Constitutive equation was obtained by characteristic points of DRX which derived from the strain hardening rate and stress curves. DRX kinetics model was established for determining the recrystallization volume fraction (X). Effect of dynamic precipitation of V(C, N) imposed on DRX at temperatures from 850-1,000 degrees C was analyzed. Results show that true stress-strain curves exhibited no clearly defined stress peaks with typical dynamic recovery behavior. X increased from 43.9% to 100% with increasing deformation temperature, which was in reasonable agreement with the observation of microstructure. Moreover, the calculation pinning force of V(C, N) precipitates was weaker than the recrystallization driving force, revealing that V(C, N) precipitates could effectively retard rather than prevent the progress of DRX.
ISSN No.:0334-6455
Translation or Not:no
Date of Publication:2017-11-01
Co-author:周双双,Liu Zili,侯志国,田青超
Correspondence Author:lxq